I don't mean that Cassini will shift a moon from its orbit, but the introduction of foreign materials, for example, could change things. Perhaps I'm putting to

I don't mean that Cassini will shift a moon from its orbit, but the introduction of foreign materials, for example, could change things. Perhaps I'm putting too much emphasis on the naturally pristine state of things around Saturn, but I've read that also is a priority of researchers, at least in some circumstances.